How to Configure DKIM, SPF and DMARC on RHEL 7 Email authentication standards — SPF, DKIM, and DMARC — are essential for any mail server that sends outbound email. Without them, your messages are likely to be rejected or placed in spam folders by major providers such as Gmail, Microsoft 365, and Yahoo. SPF (Sender […]
How to Install and Configure Dovecot IMAP Server on RHEL 7 Dovecot is a secure, high-performance IMAP and POP3 server that integrates seamlessly with Postfix on RHEL 7. While Postfix handles the transport of mail (sending and receiving via SMTP), Dovecot provides the retrieval layer — allowing mail clients such as Thunderbird, Outlook, or Apple […]
How to Install and Configure Postfix Mail Server on RHEL 7 Postfix is a high-performance, security-focused Mail Transfer Agent (MTA) that is installed by default on many RHEL 7 systems. It handles the sending, receiving, and routing of email using the SMTP protocol. Whether you are setting up a server to send application alerts, relay […]
How to Set Up a DNS Server with BIND9 on RHEL 7 The Berkeley Internet Name Domain (BIND) is the most widely deployed DNS server software in the world, and BIND 9 is the version available in the RHEL 7 package repositories. Setting up your own DNS server gives you authoritative control over a domain […]
How to Configure a Static IP Address with NetworkManager on RHEL 7 Configuring a static IP address is one of the most fundamental tasks for any Linux system administrator. On Red Hat Enterprise Linux 7, NetworkManager is the default network management daemon, and it provides two powerful tools for managing connections: the command-line interface nmcli […]
How to Automate Backups with rsync and cron on RHEL 7 Reliable backups are the foundation of any serious system administration strategy. On RHEL 7, rsync combined with cron provides a powerful, scriptable, and highly efficient backup solution that requires no commercial software or complex infrastructure. rsync transfers only changed file blocks over the network, […]
How to Set Up Software RAID with mdadm on RHEL 7 Software RAID (Redundant Array of Independent Disks) allows you to combine multiple physical disks into a single logical device that provides redundancy, improved performance, or both — without requiring a dedicated hardware RAID controller. On RHEL 7, the mdadm utility is the standard tool […]
How to Configure Samba File Sharing on RHEL 7 Samba is the go-to solution for integrating Linux servers into environments where Windows clients need to access shared files and printers. It implements the SMB/CIFS protocol natively on Linux, allowing RHEL 7 servers to appear as ordinary Windows file shares on the network. Whether you are […]
How to Set Up NFS File Sharing on RHEL 7 Network File System (NFS) is a distributed file system protocol that allows a server to share directories over a network, enabling client machines to mount and access those directories as if they were local storage. NFS has been a cornerstone of Unix and Linux networking […]
How to Configure LVM on RHEL 7 Logical Volume Manager (LVM) is one of the most powerful storage management tools available on Linux. Unlike traditional partitioning, LVM introduces an abstraction layer between physical storage devices and the file systems that use them, enabling administrators to resize volumes online, create snapshots for consistent backups, and pool […]
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